Thermos Bottle Buildings Roy Swain, P.E. Lyme Inn Radiant Floor - - PowerPoint PPT Presentation

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Thermos Bottle Buildings Roy Swain, P.E. Lyme Inn Radiant Floor - - PowerPoint PPT Presentation

Sep 01, 2022 125 likes •666 views

Thermos Bottle Buildings Roy Swain, P.E. Lyme Inn Radiant Floor Thermos Bottle Building Design Heat Loss Thermos Bottle Building Design Heat Loss -10F outside, 70F Inside -10F outside, 70F Inside Building Element Heat

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Thermos Bottle Buildings

Roy Swain, P.E.

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Lyme Inn

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Radiant Floor

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“Thermos Bottle” Building Design Heat Loss

  • 10°F outside, 70°F Inside

Building Element Heat Loss R-60 Roof 10% R-40 Walls (and Doors) 25% R-20 Basement/Foundation Walls 25% R-10 Basement Floor 5% R-5 Windows (10% of floor area) 35% Total 100% Approximate BTUH/ Sq. Ft. 5 For typical 150 Sq. Ft. Room: 750 BTUH (Hair Dryer on “Low”)

“Thermos Bottle” Building Design Heat Loss

  • 10°F outside, 70°F Inside

Note: Excludes infiltration/ventilation

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“Thermos Bottle” Building Design Internal Heat Gain Per Person 0-150 Sq. Ft./Person

Heat Source Btuh/Person Body Heat (Sensible) 250 Lights* 400 Plug Loads** 400 Total 1050

*0.75 Watts/Sq. Ft. x 150 Sq. Ft. x 3.412 Btuh/Watt (=384) ** Wilkins and Hosni, Plug Load Design Factors (ASHRAE Journal, May 2011, P. 30.

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Ventilation Air for One Person

15 cfm/ x 1.08 = 16 Btuh 300 Btuh net heat gain = ~20°F 16 Btuh/°F Therefore at -10°F outside air the 15 cfm of ventilation air needs to be at 55°F (!) to balance

  • ut the net heat gain assuming 75°F inside.

And assuming zero solar heat gain through the windows.

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Economizer Cooling

Per person, ignoring heat loss, at 150 Sq. Ft. / Person

Q = CFM x 1.08 x ΔT For 1050 Btuh/person heat gain:

  • For 20°F ΔT = 50 CFM

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Or 1/3 CFM per Sq. Ft.

  • For 10°F ΔT = 100 CFM

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Or 2/3 CFM per Sq. Ft.

  • For 5°F ΔT = 200 CFM

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Or 1-1/3 CFM per Sq. Ft.

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